HiWATER: Dataset of hydrometeorological observation network (eddy covariance system of Yakou station, 2015)

This data set contains the observation data of vortex correlativity instrument at yakou station, upstream of heihe hydrometeorological observation network, from January 1, 2015 to December 31, 2015.The station is located in qilian county, qinghai province.The latitude and longitude of the observation point is 100.2421, 38.0142N, and the altitude is 4148 m.The height of the vortex correlation instrument is 3.2m, the sampling frequency is 10Hz, the ultrasonic direction is due to the north, and the distance between the ultrasonic wind speed and temperature instrument (CSAT3) and the CO2/H2O analyzer (Li7500A) is 15cm.The original observation data of vorticity correlativity is 10Hz, and the released data is the data of 30 minutes processed by Eddypro software. The main steps of its processing include: outfield value elimination, delay time correction, coordinate rotation (secondary coordinate rotation), frequency response correction, ultrasonic virtual temperature correction and density (WPL) correction.Quality assessment for each intercompared to at the same time, mainly is the atmospheric stability (Δ st) and turbulent characteristics of similarity (ITC) test.The 30min pass value output by Eddypro software was also screened.(2) data of 1h before and after precipitation were excluded;(3) the missing rate of 10Hz original data is more than 10% every 30min;(4) the observed data of weak turbulence at night were excluded (u* less than 0.1m/s).The average period of observation data was 30 minutes, 48 data a day, and the missing data was marked as -6999.Suspicious data caused by instrument drift shall be identified in red.The eddy current correlator will be short of electricity at night in winter, resulting in the loss of data.When the 10Hz data is missing due to a problem with the storage card (1.12-3.14,10.7-12.31), the data is replaced by the 30min flux data output from the collector.Observations published include:Date/Time for the Date/Time, wind Wdir (°), Wnd horizontal wind speed (m/s), standard deviation Std_Uy lateral wind speed (m/s), ultrasonic virtual temperature Tv (℃), the water vapor density H2O (g/m3), carbon dioxide concentration CO2 (mg/m3), friction velocity Ustar) (m/s), Mr. Hoff length L (m), sensible heat flux Hs (W/m2), latent heat flux LE (W/m2), carbon dioxide flux Fc (mg/(m2s)), the quality of the sensible heat flux identifier QA_Hs, the quality of the latent heat flux identifier QA_LE,Carbon dioxide flux mass identification QA_Fc.The quality of the sensible heat and latent heat, carbon dioxide flux identification is divided into three (quality id 0: (Δ st < 30, the ITC < 30);1: (Δ st < 100, ITC < 100);The rest are 2).The meaning of data time, such as 0:30 represents the average between 0:00 and 0:30;The data is stored in *.xls format.Please refer to Liu et al. (2018) for hydrometeorological network or site information, and Liu et al. (2011) for observation data processing.

本数据集收录了黑河水文气象观测网络上游的雅库站涡相关仪观测数据，时间范围为2015年1月1日至2015年12月31日。该站位于青海省祁连县，观测点的地理坐标为北纬38.0142°，东经100.2421°，海拔高度为4148米。涡相关仪安装高度为3.2米，采样频率为10Hz，超声波风向指向正北，超声波风速和温度仪（CSAT3）与二氧化碳/水分析仪（Li7500A）之间的距离为15厘米。涡相关性的原始观测数据采样频率为10Hz，发布的数据为Eddypro软件对30分钟数据进行处理的结果。数据处理的主要步骤包括：野外值剔除、延迟时间校正、坐标旋转（二次坐标旋转）、频率响应校正、超声波虚拟温度校正和密度（WPL）校正。对每个观测数据进行质量评估，主要比较同时期的气象稳定性（Δst）和湍流特性相似性（ITC）测试。Eddypro软件输出的30分钟通过值也进行了筛选。（2）排除降水前后的1小时数据；（3）每30分钟原始10Hz数据的缺失率超过10%；（4）排除夜间弱湍流观测数据（u*小于0.1m/s）。观测数据的平均周期为30分钟，每日48个数据点，缺失数据以-6999标记。由于仪器漂移引起的可疑数据以红色标识。冬季夜间涡电流相关仪可能因电力不足而缺少数据。当10Hz数据因存储卡问题（1.12-3.14，10.7-12.31）缺失时，数据由采集器输出的30分钟通量数据替代。发布的数据包括：日期/时间、风向Wdir（°）、风速Wnd（m/s）、横向风速标准差Std_Uy（m/s）、超声波虚拟温度Tv（℃）、水汽密度H2O（g/m3）、二氧化碳浓度CO2（mg/m3）、摩擦速度Ustar（m/s）、霍夫长度L（m）、感热通量Hs（W/m2）、潜热通量LE（W/m2）、二氧化碳通量Fc（mg/(m2s)）、感热通量标识器质量QA_Hs、潜热通量标识器质量QA_LE、二氧化碳通量质量标识QA_Fc。感热通量、潜热通量及二氧化碳通量的质量标识分为三级（质量标识0：（Δst < 30，ITC < 30）；1：（Δst < 100，ITC < 100）；其余为2）。数据时间意义，如0:30表示0:00至0:30的平均值；数据以*.xls格式存储。有关水文气象网络或站点信息，请参阅刘等（2018）的研究，有关观测数据处理，请参阅刘等（2011）的研究。